If you have a wide variety of leathers to pick from select based on thickness or toughness. If you don't have any known 'hard' leathers then it's best to use something as thin as possible so that when stuck down to wood it provides a surface that yields minimally under pressure. Too much give makes for a strop that will too easily dub (round over) your edges.
While a strop like this often still works, many edges are still made keener than before stropping, they won't be as sharp as the process is capable of achieving.
While a strop like this often still works, many edges are still made keener than before stropping, they won't be as sharp as the process is capable of achieving.
